Add Getty images as data source

## Problem
The Getty Images API ([API Documentation](https://developers.gettyimages.com/docs/)) provides access to a vast global library of premium visual content (images, illustrations, video, editorial) from Getty Images and iStock. The Getty Images API is currently at version 3 and it provides access to over 477 million assets. It exposes metadata on usage restrictions, license model, product types, see more at ([Meta data](https://developers.gettyimages.com/asset-metadata/)).

## API Information
- The Getty Images API requires all requests to include an Api Key to authenticate the client(in some cases require authorization)
- Uses the Base URL (v3): https://api.gettyimages.com/v3/
- Data is returned in JSON format.
- The Getty Images API throttles client requests based on limits associated with the client’s API Key. The rate limit is configured when a customer is initially setup to use the API

## Implementation

- [ ] I would be interested in implementing this feature.

El issue no menciona archivos del repositorio ni pruebas. Empieza comparando los puntos de entrada existentes de las fuentes de datos con la documentación de Getty Images API v3 y, después, ten en cuenta la autenticación mediante API key, las respuestas JSON y los límites de tasa; se considera terminado cuando Getty Images está disponible como fuente de datos.

Escrito por el modelo de indexación a partir del texto del issue.